Commutator



H. R. SAXON.

COMMUTATOR.

APPLICATION mu) APR. 17. mm.

Patented Sept. 7, 1920.

FIEJA u'NrrED STATES nmmnr 3. mole, or'roLnDo; omo,z};assicnoa, BY Mnsm: ASSIGNMENTS, 'ro anac- PATENT OFFICE.

mo .aU'ro-nrm conronamon, or 'ron'nno, o'nio, a coarona'rIoN or DELAWARE.

COMMUTAIQB.

This invention relates to featuresof .s ulation for a series'of terminals.

l clearly 'The object of my invention is to provide a commutator of the disk type, in which the insulation material serves not only as a' meansfor insulating the commutator elements from theshaft and from each other, but also as a means of support for the various. elements. An addit1onal object is to devise a form of commutator which may be readily molded in place. Further objects, and objects relating to economies of manufacture and details of construction, will definitely appear from the detailed description to follow. I accomplish the objects of my invention by the devices described in the followin specification; my invention is efined and pended claims. Y o a A structure constituting a preferred embodiment of my invention, is illustrated in the accompanying drawin s, forming a part of this specification, in w ich:

Figure 1 is a side elevation of an embodiment of the invention in an armature;

Fig. 2 is a perspective view of a segmental terminal;

Fig. 3 is a transverse section of the mold with the segmental terminals disposed in an annular anchored series therein;

Fig. 4 is a View similar to Fig. 3 with the powdered insulation disposed over the series of terminals;

Fig. 5 is a view similar to Fig. 4 with the top of the mold-in position and the powdered insulation compacted as byhcat expansion into an integral cast or unit with the terminals;

Fig. 6 is a perspecti. view of the com- I mutator unit removed from" the cast and faced, ready to be applied to an armature shaft; and

Fig. 7 is a perspective view of the opposite side of the commutator of Fig. 6.

In the drawings, similar refere'nce numerals refer to similar parts throughout the several v.iews.

As illustrated, the commutator is composed of a series of flat truncated sectors 1,

pointed out in the ap- Y i Specification of Letters Patent. Patented Sept. '7, 1920- lication and a ruir, 1916. Serial No. 91,754. i

made of copper or any metal with similar electrical and mechanical properties. The narrowed end or top of the sector has formed in its edge, a radial'recess 2; and the broad "end or base has three radial recesses stamped in its edge,thus forming a serration of four prongs, the inner two, as 4,'of which are extended to a greater degree than the outer, as

3. -Between the prongs 4, extending at right angles from the base thereof, is a tongue 5, which is adapted to be embedded in the-insulation and to serve as an anchor} ing means for securing each sector therein, and as a conductor connection for each of the conductor terminals. The Inqld 6, for the commutator, is in the shape of a circular shallow cup. Circumferentially placed in the mold base, is a series of pins i, adapted to seat within the sector recesses 2. On the outer base edge of the mold, a series of lugs S are formed, which are adapted to seatbetweenthe prongs 4, and engage the tongue 5. A cup 10 for-the mold is also provided. Y

With these segments 1 grouped in the vmold 6, the sleeve 9 is placed in position{ the insulation compound which may he'o finely divided material for the production of bakelite introduced into the mold, the cap or upper mold piece lo'placed in position and the insulation cast say by heat expansion thus embedding the annular series of terminals or conductor segments 1 in spaced relation. The mold members 10, (i, are then separated and the completed commutator unit removed axially.

Removal of the pins 7 leaves openings 13 in theco'mmutator and'the lugs 8 on the mold edge serve to form slots 1'2 in the molded insulation in which conductors 14 are inserted, the terminals of which are soldered to the sectors 16 providing electrical connection with the coils 15 of the armature 16 on the armature shaft 17 upon which the sleeve 9 is mounted. From the above description it should be apparent that a minimum of terminal metal as copper may be ,used and cheaply assembled in this annular a insulation about said 'tei'minals in isuc manner: as to insulatethe terminalsg f each other and from the ai'piatureshatt; removing the terminals and insulation" cast as a'unit.

3. .In the building "of commuta anchoring at cwq points; of teach n'ular stin er mimmaisg -asang sulation about the anchored 'terminals, removing the insulation ca'standtermi from the anchoring? V In a commutator combination are series of condiiting con;

tact elements; a' "one" piece-jnsulationgsupf poi-t fODSfllll elements, said-support having a series of transverse slots fonits edge, adapted to fOl'm"ClllXnlielS for'theh'xmaturcterminals; a center ring ulap'ted to 'Sll port the eqmmuta'tor on the armature slia t.

5. In a-mmr'ndtatorfor armature; a substantially flat insulation" disk'of substantially uniform thickness, a series of flat sectorsembedded 'in one j side'thercof, and anchoring. means" extending, ll1t0"S:Ll(l (llSl forsesurnw" said sectors in" positioniela tive to the disk. 'f (5. In a commutator for'ar niatu'res", a SlIlI-s stantiallyflat insulation disk \of substan- 'tially uniform thickness a series'of 'jlatfsecs tors embedded in one side-thereof havimr ancliorin prongs extending into said dis for securing the sectors in positidn relative to the disk." 1

7. In a commutator for armatures; the

flirting material si stantiallyimiform. in thickness, in one fllC6"0f Wh!Cll said'plates are embedded and" thereby insulated one I combination-of a series of contact elements,

an insulation su Jport in whiclr'said ele ments are embed ed, said support .llllV lflg a series of transverse slots in its edge, axially extending prongs on the said contact eleand communicating with the said transverse slots for forming connections for the armature terminals.

aceand insulated one from another, and each of said plates having an anchoring Y 9. a A com'inutator comprisin fai circular series of concluctin plates,'-'a isk'of insu-' o A i 1 commutator comprising miser es of plates, a disk of insulation having a flat) face, said plates being embedded ,inv said f merits extonding into the insulation support.

ortion extending rearwardly int aid di k," I t from-another, each of said-plates having-an] disk to anchor the plate to the disk.

10. A commutator comprising a circular series of conducting plates, a disk Of'illSlh latin g material having; a substantially flat face into which said plates are embedded and' thereby insulated one from another, each of said plates having, a combined at taching and anchoring lug extending rearwardly into said disk.

integral lug extending rearwardly into said 11. A commutator comprising a support of insulating materiaha series of Contact plates embedded in said support, each of said plates having a lug extending in-the plane thereof )llld another lug extending at an angle thereto into said insulating material, said lugs serving to, firmly secure the plates to the support.

In witness whereof I afiix my signature.

HERMAN R. SAXON. 

